Member Steve asked an interesting question (edited for brevity).
My question is simple: Why would you ever consider stopping being hove to?
In a John Kretschmer book he was discussing this very point and said, “when heaving to is no longer an option” (loosely remembered). When is that? He did not elaborate at all.
The Pardey’s bridle system, they claim, provides sufficient drag to create a sufficient slick to provide sufficient stoppage of most (all?) breaking waves.
Even Hal Roth in his book, Handling Storms, also completely omits any comment on why someone would stop being hove to.
When the seas get big enough? When the breaking waves become more often? When the slick isn’t enough?
That's a really good question. The problem is that I don't know the answer, at least not for sure, and further no one does, as you have discovered in your research.
There are four fundamental problems here that make it impossible to answer your question definitively: